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Bulle & Eureka Parts & Restorations

The place to come for all your Bulle and Eureka restoration parts.

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Code

BU014

These Isochron springs are made to the original design but are  made from 0.15mm C902 steel instead of Invar. 18 coils of 4mm, 2 half end coils at right angles . They are  the only springs that are consistent with the compositional characteristics of the origianl Bulle spring as shown in the laboratory test conducted over 2004 / 2005. The original patent specifies Invar, but this is much too soft for use as a spring. Please see The Isochron Story.  Each is supplied in a clear perspex box.


C902 is a nickel-iron-chromium alloy made precipitation hardenable by additions of aluminum and titanium. The titanium content also helps provide a controllable thermoelastic coefficient, which is the alloy's outstanding characteristic. The alloy can be processed to have a constant modulus of elasticity at temperatures from -50°F to 150°F (-45 to 65°C).


Bulle C902 Isochron Spring

Full Technical Specification here

(Ni SPAN C 902, Nispan C, UNS N09902; BS 3127; SAE AMS 5210, 5221, 5223, 5225)


Available from Carlton Clocks www.ukclocks.com